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Mollusca "soft bodied" - Coggle Diagram
Mollusca "soft bodied"
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Bivalvia "two shelled"
Bivalves are mollusks that have two shells, connected at the umbo and held together with adductor muscles. Bivalves can move around by opening and closing their shells to propel themselves around, but many live in mud or underneath sand, and feed on substrate. They have bilateral symmetry, and their shells are made from calcium carbonate. Those like the oyster and abalone get their shiny, mother of pearl finish from nacre.
Ex: Geoduck clam "panope" 
Cephalopoda "head foot"
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Octopi "eight footed"
With 8 tentacles, a beak, a mantle, 2 eyes, 3 hearts, 9 brains, and an ink sack, octopi are some of the most intelligent invertebrates in the ocean, and octopi in captivity have even been seen responding positively to music. Octopi are carnivores that can use chromatophores in their skin to change color, along with muscles that allow them to change texture. They use their beaks to eat. Unlike other mollusks, they have lost their shells through evolution, and rely on their intelligence and camouflage to survive. They move across the sea floor by crawling or using jet propulsion.
Nautilus "sailor"
Nautili are cephalopods that live near reefs, in the deeper waters. They only eat once a month, and can live up to 20 years. While they have 90 tentacles, nautilus have no ink and poorer vision than their familial counterparts. Unlike squid and octopus, nautilus have very large shells with many gas filled chambers for swimming. They eat by using their tentacles to pull food into their mouths.
Cuttlefish "sepia"
Cuttlefish are 8 tentacled carnivorous cephalopods that can also change their color and texture. They swim using jet propulsion, but can also crawl around with their tentacles. They are also able to use ink, and have bilateral symmetry. Cuttlefish contain a cuttlebone, their devolved version of a shell, which is made out of aragonite and helps them float. Cuttlefish have 8 tentacles, a mantle, and are mainly made of soft flesh. Just like squid, cuttlefish have very short lifespans, and often only live to be 1-2 years old. Like other cephalopods, they eat by using their tentacles to bring food to their beaks.